Fixture for magnetic chucks



S. KARASICK.

FIXTURE FOR MAGNETIC CHUCKS.

APPLICATION FILED JUNE 30.1917.

1 ,3 1 2, 546 Patented Aug. 12, 1919.

' iiiiillllm I llll 5 woe/$07, J'amuel hurl?! fixture block inaccordance with UNITED STATES PATENT OFFICE.

SAMUEL KARASICK, OF NEW YORK, N. Y., ASSIGNOB TO KAB ENGINEERINGCOMPANY, OF NEW YORK, N. Y., A CORPORATION OF CONNECTICUT.

mxrunn r03. MAGNETIC onucxs.

Specification 0! Letters Patent.

Patented Aug. 12, 1919.

Application filed J'uheBO, 1917. Serial No. 177,878.

To all whom it may concern:

Be itknown that I, SAMUEL KARASIGK, a citizen of the. United 'States anda resident of the city, county; and State 'of New York,

have invented certain new and useful Improvements in Fixtures Chucks, ofwhich the following is a specification, reference being'made to theaccompanying drawings, forming a part thereof.

My invention relates to improvements for use in connection with magneticchucks designed to be clamped orheld fast to the bed plate of a'machinewhereby articles of magnetic material may be securely held and clampedin operative position, while undergoing machining operations eitherlengthwise or crosswise of the face of the chuck, by means of improvedfixtures capable of being moved in various positions on the chuck and ofsecurely holding the articles in any desired position in these fixturesfor such machining operations, which positions may be determined withgreat accuracy and quickness.

In my application for patent filed in .the United States Patent OfficeMarch 28, 1917, Serial No. 158,079, I disclosed improved forms offixture tools shown in the form of parallel bars, 'V-blocks, and angleirons, in

which the iron or steel work for the machining operation was directlysuperimposed and held fast to the fixture, such fixture being freelymovable over the face of the chuck. In my present improvement I haveprovided two coacting fixture blocks which are adjustably movable withrespect to each other, the lower fixture blocks being freely movableupon the face of the chuck and may be positioned in anydesired.positionthereon, while the upper fixture block holds the workand is'placed upon the lower fixture block and is so formed as not onlytobe movable thereon but also to be adjustable in respect theretoaccording to a predetermined scale or rela:

tionship. The fixture blocks themselves are composed of alternatesections of soft iron or soft steel plates and a nonmagnetic materialsuch as Babbitt metal, lead, copper,

fiber, and secliring these alternate sections together to form acomplete fixture.

In the accompanying drawings Figure 1 is a perspective view of a V-blockupper fixture constructed and mounted upon the lower my presentinvention;

for Magnetic Fig. 2 is a perspective view of, another formof upperfixture block semi-circular 1n vertlcal cross-section and adapted to beused in connection with the lower fixture block shown in Fig. 1;

Fig. 3 is a vertical cross-sectional view taken o'nthe line 33 shown inFig. 1 looking in the direction of the arrow;

Fig. 4 is a perspective view of another form of my invention; and

Fig. 5 is a perspective view'of still another form of my invention.

Similar numerals refer to similar parts throughout the several figures.

Referring to Fig. 1, 6 indicates the lower fixture block whichis'adapted to rest on the face of the magnetic chuck (not shown) and 7is the upper fixture block, both blocks I being composed of alternatesections 8 of soft iron or soft steel, and alternate sections 9 of anon-magnetic material, such sections or plates being securely heldtogether as shown by binder rods 10 composed of a nonmagnetic materialsuch as brass, copper or the" like. In Fig. 1, the upper surface of the.lower fixture block 6 is'hollowed out in concave form as shown, theconcavity being made cross-sectionally on the arc of a circle. The upperfixture block-7 has its under surface formed convexly, the convexity ofthe block 7 being adapted to slidingly coact in all positions with theconcavity of the block 6. The top surface'bf the block 7 is V- shaped incross-section within which the work for machining operations is held.The outer section 11 of the block 6 has formed thereon the protractorscale 12' while the outer section 13 'ofthe block'has the indicator 14adapted to coact with the scale 12 as shown for angle settings. It ismanifest that the work placed in the V-bl ock 7 may be adjustablysecured for the machining operation at a predetermined'angle withrespect to the face of upon the block 6. The magnetism of the the chuckby adjusting a to scale the relative position of the block 7superimposed upon the block 7, since the magnetic lines enter the workpiece through the magnetic sections Sin the two fixture blocks 6 and 7,which sections should be maintained in alinement as shown in Fig. 3,when the block 7 is adjusted upon the hollow face of the blockfi. InFig. 2, the top face of the fixture block 15 is flat upon which the workis placed; the block 15 carries on the outer section a scale 16 which isadapted to coact with the scale 12 of the block 6. The

work is placed upon the top flat surface of the block 15 and theresecurely held in any desired tilted position as has been heretoforeexplained with reference to the V-block- 7.

extend at right angles to the axis of rotation of the upper block 18 asshown in this figure. The upper surface of the block 17 is concave andthe under surface of the block 18 is convex, such concavity andconvexity being equal so that the block 17 may always pre-' serve asliding contact with the block 18, the

, under surface of which rests upon and is freel movable over the faceof the magnetic chuc The block 17 carries the protractor scale 19 andthe block 18 has the indicator 25.

20, as shown. The movement of the block 17 upon the block 18 isnecessarily limited to the width of the magnetic section plates 8 so asto preserve the magnetic 'linesfrom the chuck to the work piece on thetop surface of the fixture block 17, this form being shown in which, forexample, the taper on the work piece is adjusted according to thestandard scale of inch to the foot.

. In Fig. 5 I-have'shown another form of .ooacting fixture blocks forvertical adjustment 0 the work piece according to a predetermined scale.21 is the lower fixture block and rests on the face of the chuck and hasan inclined top surface, and 22 isflthe u per fixture block having anoppositely incl ined under surface,.the angles of inclina tion beingequal so that the two blocks 21 and 22 may have a sliding contact eachwith the other. The block 21 carries the scale 23 and the block 22 theindicator 24. The work is placed upon the top surface of the block 22,and itis apparentthat its horizontal position with relation to the faceof the chuck may be vertically adjusted by moving the acting membersprovide a quick and accurate adjustment of the work to the bed of themachine for the usual cutting orgrindin operation.

t will be understood that "the structure here shown may be variouslymodified and changed without departing from the limits and advantages ofmy invention, provided the operation and coaction of the arts issubstantially as indicated,'and it wil be also understood-that theinvention is not limited to any particular form or construction except1n so far as such limitations are set forth in the claims. I

I claim as.my invention 1. A fixture for use with magnetic chuckscomprising a lower fixture block movable in all directions on the faceof the chuck, and an upper work-holding block coacting with, and movablerelatively to, said first block,

said blocks beingeach composed of alternate and complementary magneticand nonmagnetic plates whereby the complementary an contacting magneticplates of each block are energized in all relative positions of theblocks by the energizing of the mag netic chuck.

2. A fixture for use with magnetic chucks comprising a lower fixtureblock movable in all directions on the face of the chuck, and asuperimposed work-holding block coacting with, and movable relativelyto, said first block, said blocks being each composed of alternate andcomplementar magnetic and non-magnetic plates where y the complementaryand contactin magnetic plates of each block are energized in allrelative positionsof the blocks by the energizing of the magnetic chuck.

3. A fixture for use with magnetic chucks comprising a lower fixtureblock movable in all directions on the face of the chuck, and an upperwork-holding block coacting with, and movable in predeterminedrelationship to, said first block, said blocks being each composed ofalternate and complementary magnetic and non-magnetic plates whereby thecom lementary and contacting magnetic plates 0 each block are energizedin all relative positions of the blocks by the energizing of themagnetic chuck.

4. A fixture for use with ma etic chucks com rising a lower fixture blocmovable in all irections on the face of the chuck, and a superimposedwork-holding block coacting with and movable'in redeterminedrelationship to, said first bloc said blocks being each composed ofalternate and complementary magnetic and non-magnetic plates whereby thecom lementary and contacting magnetic plates 0 each block are energizedin all relative ositions of the blocks by the energizing of t e magneticchuck. I

5. A fixture for use with magnetic chucks com rising a lower fixtureblock movable in all irections on-the face of the chuck, an upperwork-holding block coacting with, and movable relatively to, said firstblock, said blocks being each composed of alternate and .complementarymagnetic and non-magnetic plates whereby the complementary and contacting magnetic plates of each block are encrgized in allrelativepositions of the blocks by the energizing of the magnetic chuck, a scalemounted on one of said blocks, and a pointer on the other of said blocksto coact with said scale whereby the relative positions of the blocksmay be fixed to a predetermined scale.

6. A fixture for use with ma netic chucks comprising a lower fixturebloc movable in all directions on the face of the chuck, a

superimposed work-holding block 'coactin'g with, and movable relativelyto, said first -block, said blocks being each composed of alternate andcomplementary magnetic and non-magnetic plates whereby thecomplenrentarv and contacting magnetic plates of each block areenergized in all relative'positions-of the blocks by the energizing ofthe magnetic chuck, a scale mounted on one of said blocks, and a pointeron the other of said blocks to -coactlwith said scale whereby therelative posit-ions of; the blocks may be fixed to a predeterminedscale.

\ SAMUEL KARASICK.

Witnesses: I

GEORGE P. ROBBINS, PHILIP C. PEQK.

